FULL PIN™ technology uses ten lightweight, stamped steel cogs and one 42T aluminum cog held together with 123 high-strength stainless steel pins. The result: a cassette that's light, durable and equipped with SRAM's super wide 10-42T gear range that's a perfect fit for any ride. The open design similar to X-DOME™ cassette aids in mud clearance, giving you cleaner shifting performance and longer component life.